On 01-May-2013 13:21 +0200, mattn wrote:
> Hi, list.
>
> I wrote a patch to add new function 'capture()'.
> When you want to get a list of all commands/functions/mappings with using vim
> script, probably, you'll do like follow.
>
> ---------------------------------
> let funcs = ''
> redir => funcs
> silent! function
> redir END
> ---------------------------------
>
> I guess, most of vim script programmers want to get the result as expression.
> not command, want to get more easily.
> If vim have 'capture()' which allow to getting those command line 'function',
> I guess this is very useful.
>
> For example, getting :Command list as array.
> ---------------------------------
> :echo map(split(capture("command"), "\n")[1:], 'split(v:val[4:])[0]')
> ---------------------------------
>
> One more thing. vim doesn't support nest of :redir.
> ---------------------------------
> function! s:foo()
> let a = ''
> redir => a
> silent echo "foo"
> redir END
> return a
> endfunction
>
> function! s:bar()
> let a = ''
> redir => a
> call s:foo()
> redir END
> return a
> endfunction
>
> echo s:bar()
> ---------------------------------
>
> This 'echo s:bar()' doesn't show anything. But capture() can do it.
> ---------------------------------
> echo capture("s:bar()")
>
> foo
> ---------------------------------
>
> capture() is working on sandbox. so you can't use this in modeline.
>
> Below is a patch. How about this new feature?
>
> https://gist.github.com/mattn/5449425
While :redir has its uses in the interactive command-line, its
restriction of not allowing nesting is very bad for plugins, and I've
already been affected by this. (I had to send a patch for another plugin
so that its :redir failed gracefully when it ran inside of my plugin.)
You've shown that capture() handles a nested :redir. Just to be clear,
does it also handle a nested capture() inside a capture() execution?! (I
would expect that the outer capture gets the results of the inner
capture as well.)
If that's the case, +1 from me for inclusion.
In addition to taking commands and Lists of commands, it might also be
handy to take Funcrefs.
-- regards, ingo
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